Disable images for picker

[cmdrrobin]

Currently in Snacks picker, when I select an image file I get the following error:

# Conversion failed at step `convert`
No command available

I have disable image support for snacks, but apparently this doesn't imply for picker. (link)

How can I disable image support for picker?

[drowning-cat]

convert failed because ImageMagick is not installed.

But what exactly do you want? You have not only image files, but also other types of files you might want to preview.
Do you want to automatically hide preview each time you select an image?

Note

You can disable preview with <M-p>.

[drowning-cat]

But it doesn't actually process the image—it's just a message. Due to design implications, Snacks.image is called and prints the message. Technically, you could create a preview based on preview.file(), but it's not worth it.

Preview code:

snacks.nvim/lua/snacks/picker/preview.lua

Lines 75 to 166 in bc0630e

	---@param ctx snacks.picker.preview.ctx
	function M.file(ctx)
	if ctx.item.buf and not ctx.item.file and not vim.api.nvim_buf_is_valid(ctx.item.buf) then
	ctx.preview:notify("Buffer no longer exists", "error")
	return
	end
	-- used by some LSP servers that load buffers with custom URIs
	if ctx.item.buf and vim.uri_from_bufnr(ctx.item.buf):sub(1, 4) ~= "file" then
	vim.fn.bufload(ctx.item.buf)
	elseif ctx.item.file and ctx.item.file:find("^%w+://") then
	ctx.item.buf = vim.fn.bufadd(ctx.item.file)
	vim.fn.bufload(ctx.item.buf)
	end
	if ctx.item.buf and vim.api.nvim_buf_is_loaded(ctx.item.buf) then
	local name = vim.api.nvim_buf_get_name(ctx.item.buf)
	name = uv.fs_stat(name) and vim.fn.fnamemodify(name, ":t") or name
	ctx.preview:set_title(name)
	ctx.preview:set_buf(ctx.item.buf)
	else
	local path = Snacks.picker.util.path(ctx.item)
	if not path then
	ctx.preview:notify("Item has no `file`", "error")
	return
	end
	if Snacks.image.supports_file(path) then
	return M.image(ctx)
	end
	-- re-use existing preview when path is the same
	if path ~= Snacks.picker.util.path(ctx.prev) then
	ctx.preview:reset()
	vim.bo[ctx.buf].buftype = ""
	local name = vim.fn.fnamemodify(path, ":t")
	ctx.preview:set_title(ctx.item.title or name)
	local stat = uv.fs_stat(path)
	if not stat then
	ctx.preview:notify("file not found: " .. path, "error")
	return false
	end
	if stat.type == "directory" then
	return M.directory(ctx)
	end
	local max_size = ctx.picker.opts.previewers.file.max_size or (1024 * 1024)
	if stat.size > max_size then
	ctx.preview:notify("large file > 1MB", "warn")
	return false
	end
	if stat.size == 0 then
	ctx.preview:notify("empty file", "warn")
	return false
	end
	local file = assert(io.open(path, "r"))
	local is_binary = false
	local ft = ctx.picker.opts.previewers.file.ft or vim.filetype.match({ filename = path })
	if ft == "bigfile" then
	ft = nil
	end
	local lines = {}
	for line in file:lines() do
	---@cast line string
	if #line > ctx.picker.opts.previewers.file.max_line_length then
	line = line:sub(1, ctx.picker.opts.previewers.file.max_line_length) .. "..."
	end
	-- Check for binary data in the current line
	if line:find("[%z\1-\8\11\12\14-\31]") then
	is_binary = true
	if not ft then
	ctx.preview:notify("binary file", "warn")
	return
	end
	end
	table.insert(lines, line)
	end
	file:close()
	if is_binary then
	ctx.preview:wo({ number = false, relativenumber = false, cursorline = false, signcolumn = "no" })
	end
	ctx.preview:set_lines(lines)
	ctx.preview:highlight({ file = path, ft = ctx.picker.opts.previewers.file.ft, buf = ctx.buf })
	end
	end
	ctx.preview:loc()
	end

Here is the actual image processing function that is called:

snacks.nvim/lua/snacks/image/buf.lua

Lines 4 to 36 in bc0630e

	---@param buf number
	---@param opts? snacks.image.Opts|{src?: string}
	function M.attach(buf, opts)
	opts = opts or {}
	local file = opts.src or vim.api.nvim_buf_get_name(buf)
	if not Snacks.image.supports(file) then
	local lines = {} ---@type string[]
	lines[#lines + 1] = "# Image viewer"
	lines[#lines + 1] = "- **file**: `" .. file .. "`"
	if not Snacks.image.supports_file(file) then
	lines[#lines + 1] = "- unsupported image format"
	end
	if not Snacks.image.supports_terminal() then
	lines[#lines + 1] = "- terminal does not support the kitty graphics protocol."
	lines[#lines + 1] = " See `:checkhealth snacks` for more info."
	end
	vim.bo[buf].modifiable = true
	vim.bo[buf].filetype = "markdown"
	vim.api.nvim_buf_set_lines(buf, 0, -1, false, vim.split(table.concat(lines, "\n"), "\n"))
	vim.bo[buf].modifiable = false
	vim.bo[buf].modified = false
	else
	Snacks.util.bo(buf, {
	filetype = "image",
	modifiable = false,
	modified = false,
	swapfile = false,
	})
	opts.conceal = true
	opts.auto_resize = true
	return Snacks.image.placement.new(buf, file, opts)
	end
	end

[drowning-cat]

Oh, sorry. Can you install ImageMagick and try again, will it show the image?

[cmdrrobin]

When I install ImageMagick the error message goes away.

If there is no option to disable it, then I have to deal with it ;)

[drowning-cat]

This is the easiest solution you can use without having to create your own preview — but you'll probably see why it's not the best-looking approach:

config = function(_, opts)
  require('snacks').setup(opts)

  local supports_file = require('snacks.image').supports_file
  Snacks.image.supports_file = function(file)
    if not Snacks.image.config.enabled then
      return false
    end
    return supports_file(file)
  end
end,

opts = {
  images = {},                  -- Snacks.image.config.enabled == true
  images = nil,                 -- Snacks.image.config.enabled == false
  images = { enabled = true },  -- Snacks.image.config.enabled == true
  images = { enabled = false }, -- Snacks.image.config.enabled == false

[cmdrrobin]

Well, this works fine by me. 👍🏻

[cmdrrobin]

I see what you trying to do, but when I set image = { enabled = true } it doesn't show the image.

[cmdrrobin]

Ah found the issue. Forgot to add return in front of support_file.